Structural results for La Palma island using 3‐D gravity inversion

Camacho, A. G.; Fernández, José; González, Pablo J.; Rundle, John B.; Prieto, Juan Francisco; Arjona, A.

doi:10.1029/2008jb005628

Cited by 44 publications

(60 citation statements)

References 61 publications

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“…In the framework of GEOMOD project, a terrestrial gravity survey was carried out in 2006 on 317 benchmarks on the Island of La Palma (Canary Islands) (CAMACHO et al, 2009), Figure 2. The corresponding elevation values were determined simultaneously by GPS observations.…”

Section: Structural Studiesmentioning

confidence: 99%

“…From the gravity data, CAMACHO et al (2009) obtained several results pertaining to structural properties of the island connected with the tectonic environment and local volcanism. There, a nonlinear, three-dimensional gravity inversion approach was considered to provide the geometry of the anomalous bodies constructed in a random growth process with respect to an exponentially stratified background.…”

Section: Structural Studiesmentioning

confidence: 99%

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Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

Prieto

González²,

Seco

et al. 2009

Pure appl. geophys.

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We review the results of the geodetic and structural studies carried out on La Palma Island using geodetic and geophysical data during the period 1992-2007. InSAR and GPS observation techniques were applied to study the existence of deformation on the island and gravity observations were carried out for structural studies. Gravity data were inverted using a nonlinear three-dimensional gravity inversion approach to obtain the geometry of the anomalous bodies constructed in a random growth process with respect to an exponentially stratified background. The main structural feature is a large central body (under the Caldera de Taburiente) with high density, which was interpreted as the Pliocene-age uplifted seamount and a relatively dense intrusive plutonic complex/magma body. The Cumbre Vieja series is characterized by elongated minima distributed according to the rift structure. InSAR results show a clear subsidence located on the Teneguı´a volcano, where the last eruption took place in 1971. A thermal source is the most probable origin for this deformation. A GPS network composed of 26 stations covering the total island surface was set up. Vertical displacements determined comparing the GPS coordinates obtained in 2007 with coordinates determined in 1994 are consistent with the InSAR results obtained in the southern part of the island. This is not the case for the northern part. From the comparison of 2006 and 2007 coordinates it is clear that more time is needed to obtain significant displacements, but observed trends are also consistent with InSAR results. All the observed significant displacements are in stations located outside of the large high-density central body.

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Section: Structural Studiesmentioning

confidence: 99%

Section: Structural Studiesmentioning

confidence: 99%

Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

Prieto

González²,

Seco

et al. 2009

Pure appl. geophys.

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“…9). Cape Verde and the Canaries show an increase in magmatism since about 3 Ma, but it is likely that the peak occurred at 0.5 Ma (refs [13][14][15][16][17]. The Madeira Province shows the same trend, with increasing magmatism since 3.5 Ma, probably reaching a peak at about 1 Ma (ref.…”

Section: Magmatic Events For the Studied Hotspots Since 5 Mamentioning

confidence: 54%

Late Cenozoic Global Pulsations in Hotspot Magmatism and their Possible Interplay with Plate Tectonics, Earth's Core and Climate

Mjelde

2016

Current Science

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A study of the Earth's main hotspots indicates an increase in magmatism during the last 1.5 myr, supporting a previous hypothesis on global magmatic copulsation on c. 10 myr scale through the Cenozoic. A similar pattern is found for magmatism dominantly related to plate tectonics since 15 Ma. It is suggested that the inferred syncronicity in magmatism is related to two large areas under Africa and the central Pacific expressing anomalously slow S-wave velocities in the lower mantle. Heterogeneous heat flux in the fluid outer core related to the lower mantle anomalies may cause spatially related aspherical inner core growth and rotation of the inner core with respect to the lower mantle. It is speculated that the heterogeneous heat flux in the outer core can be modulated by inner core processes of aspherical growth and rotation on 10 myr scale, subsequently leading to syncronized plume pulses from the rim of the hot lower mantle anomalies. Some of the magmatic pulses appear to coincide with abrupt drops in eustatic sea level, and it is suggested that these were caused by glaciations triggered by the volcanism.

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“…Large parts of the basic inversion methodology and associated mathematical concepts are described in Camacho et al (2009Camacho et al ( , 2011a. We therefore summarize the key concepts here.…”

Section: General Approachmentioning

confidence: 99%

“…Oldenburg, 1974;Chakraborty and Agarwal, 1992;Reamer and Ferguson, 1989). Camacho et al (2009 and2011a) describe a general method and a code ("GROWTH") to carry out a 3D gravity inversion in a non-subjective approach, able to determine the geometry of the causative bodies. Camacho et al (2011b) proposed a modification of the original methodology enabling to deal with isolated bodies or stratified structures in a versatile form.…”

Section: Introductionmentioning

confidence: 99%

Structure of Alluvial Valleys from 3-D Gravity Inversion: The Low Andarax Valley (Almería, Spain) Test Case

Camacho

Carmona

García‐Jerez

et al. 2014

Pure Appl. Geophys.

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This paper presents a gravimetric study ( We interpret several low density alignments as corresponding to SE faults striking about N 140-145ºE. Some detected basement elevations (as one, previously known by boreholes, in Viator village) are apparently connected with the fault pattern. The outcomes of this work are:(1) new gravimetric data, (2) new methodological options, and (3) resulting structural conclusions.3

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Structural results for La Palma island using 3‐D gravity inversion

Cited by 44 publications

References 61 publications

Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

Geodetic and Structural Research in La Palma, Canary Islands, Spain: 1992–2007 Results

Late Cenozoic Global Pulsations in Hotspot Magmatism and their Possible Interplay with Plate Tectonics, Earth's Core and Climate

Structure of Alluvial Valleys from 3-D Gravity Inversion: The Low Andarax Valley (Almería, Spain) Test Case

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